Computer for ballistic interactions



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2 Claims.

This invention relates to apparatus for the control of artillery re, andparticularly to electromechanical artillery computers.

The object of the invention is an apparatus correcting for the ballisticeffects of non-standard ballistic conditions and for the ballisticeiiects of interactions between non-standard ballistic conditions.

In prior electromechanical artillery computers, it was assumed that theballistic eiiects are independent of each other, and that independentcorrections could be made for each effect. It has been found that thisassumption is incorrect, and that certain ballistic effects interactwith other ballistic effects to produce an appreciable error. Assumethat both the muzzle velocity of the weapon. and the density of the airare nonstandard. In prior computers, corrections were made fornon-standard muzzle velocity with standard air density and fornon-standard air density at standard muzzle velocity. In the presentcomputer, corrections are made also for the effect of nonstandard airdensity on the correction for non-standard muzzle velocity and for theeffect of non-standard muzzle velocity on the correction fornon-standard air density.

In the drawings:

Fig. 1 schematically shows a system for transmitting data from theobserving stations to the computer;

Fig. 2 schematically shows a system for generating voltages proportionalto the coordinates of the present position of the target;

Fig. 3 schematically shows a system for synthetically generatingvoltages proportional to the coordinates of the present position of thetarget, or voltages proportional to the rates of change in saidcoordinates;

Fig. 4 schematically shows a system for indicating the present'positionof the target with respect to the gun, for generating voltagesproportional to the rates of change in the coordinatos, and voltagesproportional to the coordinates of the predicted positionrof the target;"Figi 5 schematically shows a system for indicating the azimuths andquadrant elevations of two guns, generating a voltage proportional tothe range of the second gun, and generating volt- 'ages proportional tothe maximum effects of the wind;

Fig. 6 schematically shows a system for indicating thc deection angle ofa rst gun, for generating voltages proportional to the range of the mstgun, and for indicating the ballistic elevation angle of a second gun;

mor one hundred yards, are transmitted by a dataF`v` Figs. 7 and 8schematically show 'a system for indicating the ballistic elevationangle of a iirst sun:

Figs. 9 and 10 show, in elevation and plan, the

geometric relationships between the observation stations, target andguns;

Fig. 11 schematically shows a summing ampliiier used in Figs, l to 8;

Fig. 12 schematically shows a controll circuit used in Figs. 4, 5, 6, 8;

Fig. 13 schematically shows a number of potentiometer networks;

Figs. 14 to 18 show curves related to the networks of Fig. 13;

Figs. 19 to 28 show curves related to Figs. 7 and 8;

Fig. 29 shows an operation table for the switches and potentiometers ofFig. 5 and the relays and ampliers of Fig. 4.

Fig. 30 shows the assembly arrangement of Figs. l to 8, inclusive, tomake up a schematic diagram of the complete system.

The present director is primarily intended for the control of coastdefense artillery, but the invention is not limited to such use, as itmay be used in many other artillery directors in which unusual accuracyis required.

The largest coast defense weapons have ranges of twenty miles or more,thus, a target moving along the coast may be under observation fortwenty to thirty miles on each side of the gun. A number of observationstations are distributed at convenient points along the coast and, asthese stations may be more than twenty miles from the director, thetransmission of the observed data from the observation stations to thedirector by the usual synchronous transmission systems, may beimpractical. In the present system, the even degrees of azimuth or thehundreds of yards may be transmitted orally at regular intervals over atelephone system between the observing station and the director, whilethe fractional values of the data less than one degree transmissionsystem of the type shown in United tates Patent 1,483,235, February 12,1924, R. V. Morse.

As shown in Fig. l, each base end station is furnished with a telephoneinstrument I connected to the secondary winding of a composite coil 2having line windings intercalated in series with the data transmissionline. A capacitor 3 confines the telephone current to the transmissionline.

At the director, a similar composite coil Al has line windingsintercalated in the trans-

